A test is used to screen people for hepatitis B. The sensitivity of the test is 95% and the specificity of the test is 90%. Assume that the total number of persons being tested for hepatitis B is 50,000. Assume that the true prevalence of hepatitis B in the population is 100 per 50,000.Calculate the number of true positives and the number of false positives
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A test is used to screen people for hepatitis B. The sensitivity of the test is 95% and the specificity of the test is 90%. Assume that the total number of persons being tested for hepatitis B is 50,000. Assume that the true prevalence of hepatitis B in the population is 100 per 50,000.Calculate the number of true positives and the number of false positives .
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- A test is used to screen people for hepatitis B. The sensitivity of the test is 95% and the specificity of the test is 90%. Assume that the total number of persons being tested for hepatitis B is 50,000. Assume that the true prevalence of hepatitis B in the population is 100 per 50,000. Calculate the number of true positives Calculate the number of false positivesThe order for an adult who needs passive hepatitis B prophylaxis reads: “Give hepatitis B immunoglobulin (BayHep B), 0.06 mg/kg IM now, and then again in 30 days.” The patient weighs 176 pounds. How many milligrams will this patient receive per dose?This graph shows incidence of severe diarrhea (spelled diarrhoea here) in a single country from January 2006 to July 2018, as measured by hospital admission. Which line shows only the diarrhea cases caused by rotavirus? A. The orange line B. The blue line C. There is no way to know
- a) A new test for onuriangiema has a 0.78 probability of positive given a sick patient and a 0.75 probability of a negative given a healthy patient. If the probability of someone in the general population having onuriangiema is 0.34, then what is the probability a positive result means someone has the disease? Give three digits past the decimal point. b) A new test for onuriangiema has a 0.78 probability of positive given a sick patient and a 0.75 probability of a negative given a healthy patient. If the probability of someone in the general population having onuriangiema is 0.34, then what is the probability a negative result means someone has the disease? Give three digits past the decimal point. c) Assume a Hardy-Weinberg distribution for the recessive condition tercho If 9/16 of the population are homozygous dominant then what fraction have tercho? Give three digits past the decimal point.During 1972, 29 cases of tularemia occurred in a county with a population of 7,000 persons. Calculate the incidence of tularemia per 100,000 persons in that county during that year.Two new tests (A and B) have been developed to diagnose gout. The following tables provide information on the number of individuals testing positive or negative and their true status: Calculate the sensitivity, specificity, and positive predictive values for both tests. b) Imagine a situation where the consequences of false negative test results are worse than a false positive test. For example, patients that have gout but test negative may not be treated properly and develop other complications. Which test would you use in this situation? Why?
- For items 40-41, refer to data below: The rapid antigen detection test for streptococcal pharyngitis has a positive and negative likelihood ratio of 20 and 0.05, respectively. The pediatrician evaluates his 5-year-old patient who had sudden onset of sore throat, exudative pharyngitis, and a fever of 39°C. He estimates the pretest probability of streptococcal pharyngitis in this child to be 50%. Use the likelihood ratio nomogram provided to estimate post-test probability. 0.1 0.2+ 98 0.5+ 95 2000- 1000 500 200 100 50 20 10+ 90 2+ +80 +70 +60 +50 +40 +30 10 40. If the rapid antigen test is positive, what is the probability that this child has actual streptococcal pharyngitis? A. Approximately 75% B. Approximately 85% C. Approximately 95% D. Approximately 98% 20 30+ +20 40- 50- -05 +02 10 +5 +002 +001 +0005 +002 +0.001 +0.0005 70+ 80+ +2 90+ +1 95 +0.5 41. If the rapid antigen test is negative, what is the probability that this child truly does not have actual streptococcal pharyngitis?…Your 66-pound patient is receiving Keflex (cephalexin) PO every six hours for impetigo. The recommended safe dose range is 25-100 mg/kg/day. The ordered dose is 500 mg PO every 6 hours. Does this dose fall within the recommended safe dose range? I'm very confused about this question and don't know how I should approach itA very severe form of hepatitis may result when co-infection with Hepatitis B virus and Hepatitis D virus occurs in an individual. A. True B. False
- A DVT (deep vein thrombosis) clinic had 320 persons appearing for lower extremities Doppler ultrasound study. If 48 out of 80 subjects with DVT tested positive for the DVT, and 228 out of 240 without DVT tested negative Calculate the following What does this NPV here mean The prevalence of DVT What is the 2 x 2 contingency table What is the difference between prevalence with regard to PPV and NPV?A. Provide a brief description of a hypothetical food-borne outbreak case. Click or tap here to enter text. B. Provide hypothetical data sets corresponding to the following tables (simply fill out the tables, do not remove rows nor columns but you may add more rows for your cases/incubation periods/food items if you wish to): Table 1: Case status and demographic factors Case (Y/N) Record Number 1 Sex (M/F) Age (in years) 3 4 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Table 2: Incubation periods and case counts Incubation period (days after exposure) 1 Number of cases 2 3 4 5 6 7 Figure 1: Epidemic curveFor the following diseases, describe the best technique for diagnosing them. Please make sure you include how you would tell someone with the disease from someone without the disease. C. Babesiosis is an infection by the parasite Babesia microti that is carried by deer ticks, similar to Lyme disease. The parasite infects red blood cells in humans.